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Vermiculite Compressive Strength - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Vermiculite Compressive Strength

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  • Vermiculite Compressive Strength

    Does anyone know if the hearth four inch vermiculite-cement insulation layer is stable enough to support a six foot brick flue? Vermiculite seems to be too soft and is causing concern. If any of you have or know of any ovens with longer flues, please advise.

  • #2
    Re: Vermiculite Compressive Strength

    Yes it is stable. My oven has over 7 inches of thermal mass for the floor and dome. So it's almost twice in weight of a standard oven and my vermiculite has not settled at all. You are good to go.

    I though the same thing when I built mine. I made a test piece and was truly surprised how strong it is.

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    • #3
      Re: Vermiculite Compressive Strength

      How about a half ton oven sat on 1" of vermiculite?

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      • #4
        Re: Vermiculite Compressive Strength

        Originally posted by sonomacast View Post
        How about a half ton oven sat on 1" of vermiculite?
        You may need to put some sort of support ring around the outside of the vermcrete to contain and protect the outer edge.

        Chip
        Chip

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        • #5
          Re: Vermiculite Compressive Strength

          I built my oven on a 4.5 inch layer of 5:1 vermicrete. As I was mortaring the oven, I used the excess mortar on the outer edges. I finally mixed a big batch and finished covering the ends of the vermicrete layer, worked fine.
          Leigh

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          • #6
            Re: Vermiculite Compressive Strength

            Thanks for the comments. I feel better about the vermicrete supporting the heavier than usual flue.

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